<style>
    div {
        float: left;
    }
    input {
        width: 50px;
    }
</style>

<div>
    <p>期数间隔：<input type="number" id="interval" min="1" step="1" value="1"></p>
    <p>计算方式：<select id="operator">
        <option value="+">+</option>
        <option value="-">-</option>
        <option value="*">*</option>
        <option value="/">/</option>
    </select></p>
</div>
<div>
    <canvas id="box"></canvas>
</div>
<div>
    <p>选择数值：<span id="flagNums"></span></p>
</div>

<script src="data.js"></script>
<script src="dream.js"></script>

